排除前区:04,07,09,11,18,22,23,33=0-1
排除后区:05,07,08,11
B:龙头凤尾:
龙头关注:02或06
凤尾关注:29或31
C:前区方案:
a-10码:02,06,08,10,14,20,24,25,29,31
b-14码:01,02,03,05,06,08,10,14,20,21,24,25,29,31
c-18码:01,02,03,05,06,08,10,14,20,21,24,25,26,28,29,30,31,32
D:后区方案:
后区2码:06,09
后区4码:06,09,10,12
后区6码:01,03,06,09,10,12